Photographic-printing frame



' Aug. 10 1926. I 1,595,590

. o. ULLMANN I PHOTOGRAPHIC PRINTING FRAME I Filed March 18, 1926 Im emor: Osmar Human"- 5y flui ammy Patented Aug. 10, 1926.

UNITED STATES 1,595,590 PATENT 1 OFFICE; j

0am ULLMANN, OF HIMMELSFURST, GERMANY, ASSIGNOR TO THE FIBMOF TILL-MANN & 00., 0F HIMMELSFURST, GERMANY.

rnoroenarmc-rnnv'rme FRAME.

Application filed March, 1926, Serial No. 95,615, and in Germany April 1, 1925.

This invention relates to photographic printing frames comprising a cover adapted to be pressed against the carrier of the sensitive sheet by means of transversely extending curved spring bars. It is an object of my invention to provide means for easily applying and withdrawing the said spring bars. I use a spring of flat material formed into the shape of the inverse capital Greek letter omega and secure this omega-spring with its middle ortion upon the bottom of a recess of one rame member; I give the said omega-spring such dimensions that the spring bar mentioned abovehas on its/end to be gripped a breadth a little greater than the narrowest distance or clearance between the two shanks of the omega-spring, this omega-spring being not strained. Therefore the spring bar is caught by the omega-spring after pressing down and becomes free, again after pressing upwards. This pressing upwards is done bva finger of the photographer gripping under the end of the spring bar projecting beyond the frame member carrying the omega-spring.

With these and other objects in view, the invention comprises certain novel units, elements, parts, functions and combinations, as will be hereinafter more fully described and claimed.

In the drawings:

Figure 1 is a front view of a photographic printing frame made in accordance with the present invention, seen from the glass side;

Figures 2 and 4 are edge views of the frame, seen from the upper and the lower side respectii'ely; e a

Figure 3 is a rear elevation of the frame;

Figure 5 is a view showin a transversal section along the line V--V 0 Fig. 3

Figure 6 is a front view of a staple and Figure 7 is a front view of an omegaspring.

Like characters of reference indicate corresponding parts throughout the several views.

The improved printing frame which forms the subject matter of this application comprises two longitudinal frame members 1, 1 and two transversal frame members 2, 2 united in a well known manner on the cor-- ners by means of double mortise and tenon joints 3, all these members referably being made from Gaboon crossaminated woo boards. The frame members have inward projecting edges 4. The frame being laid upon its front side, the glass negative 5 is laid upon the projecting edges 4 in the usual manner and'the film, card, glass plate or other carrier 6 of the sensitive sheet is laid upon the negative. The cover then to be laid above comprises preferably two unequal sections 8 and 8" united together by a hinge joint 7. Both sections are provided on their side to be laid upon the sensitive sheet carrier with yielding material such as gauzeflannel. The transversal frame members 2, have in their middle part a recess 9 for the purpose to facilitate the gripping of the carrier 6 of the sensitive sheet by the fingersof the photographer;

-Behind the middle line of each cover section a curved plate spring or spring bar 10 extends transversely that is to say parallell y to the axle of the hinge-joint 7. The ends of both plate springs lie in recesses 11 and 12 of the longitudinal frame members 1, l The one end ofeach plate spring is rolled to form a hinge-eye 13 passed through by a wire axle 14 the projecting ends 14: of which are turned down at right angles and tapered to form a staple to be driven into the wooden frame member 1. The plate spring 10 being applied in its effective position, the hinge-eye 13 lies in the recess 11 of the frame member 1.

Each of the recesses 12 of the frame member 1 is crossed by a milled groove 15 to receive a plate spring-16 curved into'the form of the inverse capital Greek letter omega, comprising a middle part 16 and two shanks 16 which, on their narrowest way for. passing through, have a distance a little smaller than the breadth of the plate spring 10, the omega-spring not being expanded. The ends 19 of the omega-spring are turned outward approximately parallelly to the outer plane of'the frame member 1 and are sunk beneath this plane. Each omega-spring 16 is secured by means of a screw bolt 18 passing through its middle part 16' on the bottom of the groove 15 of the frame member 1.

In closing the printing frameythe free end of each plate'spring 16 is pressed down between the yielding shanks 16 of the appertaining omega-spring and after pressing down the plate spring end is caught by the omega spring shanks moving together again.

The extreme end of eachplate spring projects outwards beyond the frame member 1 to facilitate the opening by a finger of the photographer gripping under the projecting end.

By means of the device described the copy to be printed can be laid in and taken away and further it is possible to open only the smaller cover section for inspection of the copy.

Claims 1. In combination in a photographic printing frame with frame members for receiving the negative plate and the carrier of the sensitive sheet, a cover, a curved plate spring to press the cover against the said carrier, a hinge-joint to connect the one end of the plate spring with the one frame member, a plate spring formed into the shape of the inverse Greek capital letter omega and means to secure the middle part of the said omega-spring on the frame member oppositel; to the frame member carrying the hinge-joint, the clearance between the contracted shank portions of the unexpanded omega-spring being narrower than the breadth of the curved plate spring.

2. In combination in a photographic printing frame with frame members for receiving the negative plate and the carrier of the sensitive sheet, a cover, a. curved plate spring to press the cover against the. said. carrier, ahinge-joint to connect the one end of the plate spring with the one frame memher, a first recess in the said frame member to receive the hinge-joint, a second recess in the frame member oppositely to the named frame member, a groove crossing the second recess, a plate spring formed into the shape of the inverse capital Greek letter omega and means to secure the middle part of the said omega-spring on the bottom of the groove, the passa e way between, the shanks of the omega spring being narrower than the breadth of the curved plate spring.

3. In combination in a photographic printing frame with frame members for receiving the negative plate and the carrier of the sensitive sheet, a cover, a curved plate spring to press the cover against the said carrier, a hinge-joint to connect the one end of the plate spring with the one frame merber, a first recess in the said frame member to receive the hinge-joint, a scsond recess in the frame member oppositely to the named frame member, a groove crossing the second recess, a plate spring formed into the shape of the inverse capital Greek letter omega, means to secure the middle part of the said omega-spring on the bottom of the groove, the passage be tween the shanks of the omega-spring being narrower than the breadth of the curved plate spring, the extreme end of the plate spring projecting beyond the frame member carrying the omega-sprin".,

In testimony whereof I afli'x my signature.

OSMAR ULLMANN. 

